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E2020 General Step TDR Training



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E2020 General TDR Training from AEA Technology, Inc. For further assistance, visit our dedicated help desk at or send an email to You can also visit us online at

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E2020 General Step TDR Training

  1. 1. E20/20 Step TDR Operator Training January 24, 2012 Revised 11/20/12
  2. 2. Subject Slides E20/20 Step TDR and Accessories 1-7 About the E20/20 TDR & models 8-10 Batteries, primary and alternative 11 How TDR’s work and Cable Construction 12-18 Power on, LCD Display & Eexample Traces 19-23 Keypad & Menu Keys 24-31 Function Keys 32-37 Advanced Features 38-43 ETDR PC Vision 44-51 Cleaning E20/20 TDR 52 Warranty, Maintenance & Contact Into 53 Questions & Acknowledgements 54 Table of Contents 2
  3. 3. E20/20 TDR with Soft Carrying Case 3 Our Soft Carrying Case is now Standard with all E20/20 TDR Models
  4. 4. USB Cable A-to-Mini B Not Pictured: CD-ROM Quick Start Guide Basic Guide N-to-BNC adapter & BNC-to-Alligator Leads Belt Case E20/20 TDR & Included Accessories E20/20N TDR AC and DC Power Adapters 4
  5. 5. CD-ROM CD Folders ETDR PC VisionTM Software - - MS Windows XP® , Win 7® or Vista® TDR Application Notes - - - - - - 20+ Detailed Notes on TDR uses Operation Manual - - - - - - - - - Electronic Copy Only Basic Guide - - - - - - - - - - - - - Backup to Printed Copy Quick Start Guide - - - - - - - - - Backup to Printed Copy Training PPTs - - - - - - - - - - - - General/Broadcast Training CATV Technician Telephone Technician Also available at: 5
  6. 6. AC or DC Power and Recharging 12.5 VDC @ 500 mA Vehicle running is preferred DC power permits operation OR recharging, but not both 100-240 VAC 50/60 Hz AC power permits operation AND Recharging 6
  7. 7. Optional Accessories N Model Adapters N-to-TNC N-to-SO239 N-to-SMA Kit BNC Coax Lead 6 ft (2m) Test Leads F Test Lead 4ft (1.2m) Quick Connect DC Power Cord Ext. USB Cable Ext. Hard Carrying Case 7
  8. 8. Shown with BNC & RJ-45 connector Other connector combinations are: N only F and RJ-45 E20/20 Instrument Layout Quarter VGA backlit display High tactile feel & weather resistant keypad with Function Key LEDs Rugged ABS plastic case with prop stand on the back 8
  9. 9. E20/20B Network Top End BNC Connector USB-2 Mini Port DC Input power jack Charging Indicator LED 9 RJ-45 Port
  10. 10. E20/20F Network Model E20/20N Model Field Replaceable F connector 10
  11. 11. Battery Installation CAUTION NO mixing cells Same Type & mAhr BATTERY MENU Select Alkaline or NiMH/NiCd and enter rated mAhrs 11
  12. 12. How Does a TDR Work? The same as RADAR Time 12
  13. 13. Cable Velocity and Distance Velocity is designed in a cable at the time of its manufacture Velocity is expressed as a fraction of the speed of light Examples: .66c or 66.7c Time 2 X Velocity = Distance 20 n Sec 2 X .66c (648,172,800ft/sec) = 6.48 feet VF or VP Beware of VF Uncertainty VoP or NVP 13
  14. 14. Impedance “Z” Z = 50 Ohms Z = 100 Ohms 14
  15. 15. Cable Impedance (Z) and Reflections Impedance is a factor of both the conductor and the dielectric of the insulation between the conductor & shield or twisted pairs Any deviation from the manufactured Z will cause reflections Open Zo=50Ω or 100Ω Z = ∞Ω Open Z = 0Ω Zo=50Ω or 100Ω Short Short 15
  16. 16. Pulse TDR Pulse TDR Longer and Longer Dead Zones 16
  17. 17. Step TDR = No Dead Zones – Any Range Fault readings in Ohms Step TDR 17
  18. 18. Example Step TDR Reflections Good Splice Poor Splice Mixed Impedances Bridged Tap Water Split Pair That Resplits Pinched Coax Poor Quality Coax 1 2 9 10 1 3 What a “Pulse TDR” Cannot See 18
  19. 19. ON cycle runs Self Test, Calibration, and Restores last use settings Input Voltage Detect Warning (>1VAC pk-to-pk or 50VDC OFF cycle saves all settings Battery Saver shuts down saves all settings Powering Up/Down Input over-voltage protection to 250 VAC or DC 19
  20. 20. Soft Reset & Hard Power Down Perform Soft Reset if: 1. TDR menu cursors are unresponsive 2. Measurement Screen disorganized 3. Other performance issues Perform a Hard Power Down if TDR will not turn off normally Press and hold for 10 seconds Then power on with a Soft Reset 20 Then “Default Settings” will flash in the splash screen and Measurement Screen will open to 0-1KΩ Z Scale Then 1 Sec Press & Hold 2 Sec Release
  21. 21. Measurement ScreenCable Type, Impedance, & Velocity Impedance Scale Plot Range Cursor Data – Feet, Inches or meters and Impedance 1 of 2 Cursors Blinking Low Battery indicator (~20 minutes power remaining) 21
  22. 22. Example E20/20 TDR Traces Pinched Coax Wet Cable 22 Open Coax Shorted Coax
  23. 23. Coax Shield Fault Good Splice Bad Splice Example E20/20 TDR Traces 23 Series Resistive Fault
  24. 24. Menu keys By name LED’s indicates active Function keys Cable ID tones for coax & twisted pair Cell style alpha- numeric entry pad Keypad Exits menu and saves changes Enters A/N changes, distance marks, & Soft Reset ON/OFF Cursors, & data selection control 24
  25. 25. Used to confirm or accept alpha-numeric entries, highlighted list selections and cursor marked entries for certain features Soft Reset - Press 5 times fast after pressing ON key to activate. Return to Measurement Screen from menu or back up one menu level. Saves all menu changes Keypad Controls 25
  26. 26. Step-by-step set up guidance How the menus work Cable menu options guide Test Lead Null guide Action keys’ LEDs guide With NO action keys or other menu key selected Help Key 26
  27. 27. Context sensitive help works with active Function keys or menu keys and cursor selected features and functions Context Sensitive Help Example 27
  28. 28. Off, Low, Med, & High Raise for cold, lower for hot Coax or RJ45 A thru D ►Sub menu to change ON or OFF Meter Menu 28 ► to open full menu
  29. 29. 20, 50, 100, 200, 500, & 999 10ft – 20Kft (2m – 5Km) Offsets display range by entry. 0 = TDR connector or Test Lead end if Test Lead Null is ON ON or OFF (slide 39 for details)ON or OFF OFF, KINKS ONLY or ALL FAULTS (slides 37 & 38 for details) Trace Menu 29
  30. 30. Memory Menu 30
  31. 31. Cables Menu Compute a cable’s VF by testing a sample of known length – guided process Find a cable’s VF from known points – guided process 31
  32. 32. Minimum 10 ft or 2m Maximum 20Kft or 5Km Increase/decrease display range 32
  33. 33. Zoom Limits: Minimum 10ft (2m) to Maximum Set Range Zooms on active cursor 33
  34. 34. Scales: 20, 50, 100, 200, 500, & 1KΩ On lower Scale settings cable Z0 will stay centered 34
  35. 35. Single active cursor has LED lit Rules when both cursors are on screen: 1. Both LEDs are lit 2. Last cursor key touched is active 3. Last cursor key touched appears on LCD with differential readings to other cursor’s – distance and Ohms 35
  36. 36. Tones generated on coax or selected twisted pair Most standard inductive amplifiers (probes) will pick up the tones TDR trace is not available While toning the cable. Battery Saver is suspended INPUT CHANNEL: Press for a menu of Tones 36 Future models will accommodate Pocket Toners
  37. 37. E20/20 TDR Advanced Features MICRO FAULT – Locate minute defects in coax TEST LEAD NULL – Remove unknown test lead length from measurement VELOCITY SEARCH – Pin-Point an installed cable’s true VF based on cable’s known length or known distance to an event. SAMPLE A CABLE – Find the VF for a cable sample to apply to all the cable in that box, reel or lot number. 37
  38. 38. Micro Fault ► MICRO FAULT – KINKS ONLY 38 For small kinks and crushes in coax cablesTDR’s normal display will shift to an amplified reflection display with Z0 as base line . In this example a fault barely seen in the normal impedance display shows up clearly.
  39. 39. Micro Fault ► MICRO FAULT – ALL FAULTS 39 Mainly for coax or high quality twisted pairsTDR’s normal display will shift to an amplified reflection Display Z0 centered, no dribble-up & reduced Z Scale. In this example a fault barely Seen in the normal impedance display shows up clearly.
  40. 40. Test Lead Null Use a cursor to mark the End of the test lead and Press to set the length 40
  41. 41. Velocity Search When to use – If you have an installed cable with known lengths either to the end or an event on the cable. E20/20 will compute the cable’s VF based on marking the distance with a cursor, then use the to adjust the cable end or event to that distance. Press when end of cable and cursor are aligned to use the modified VF and return to Measurement Screen 41
  42. 42. Sample a Cable When to use – If you have a cable sample 10-50ft (3-15m) with an accurately measured length, and plan to install or test cable’s from it’s same reel or box. 42 Mark the end of the sample. Press and enter ft then in. Press TDR computes VF
  43. 43. Questions on E20/20 TDR? 43
  44. 44. ETDR PC VisionTM Software Operates on: Windows XP® , Windows 7® or Vista® Platforms Upload saved or current traces to the PC Archive the traces on the PC or other memory media No platform license – Load on any number of PC’s Upload and Download Cable Lists to the E20/20 TDR Upload and Download instrument setups to the E20/20 TDR 44
  45. 45. Getting Started with ETDR PC Vision 1. Locate ETDR PC Vision folder on the enclosed CD-ROM or download it from 2. Turn on the E20/20 TDR and wait for the Measurement Screen (will not communicate if off or in menus). 3. Connect the TDR and PC using the supplied USB Cable 45 4. Double-click the icon on the desktop to open application
  46. 46. User Friendly Communications Setup ETDR PC Vision automatically scans for the E20/20 TDR when it opens 46 FTDI Drivers May need to be installed. Drivers are located on enclosed CD and instructions are in the Operator Manual.
  47. 47. Get Trace Tab 47
  48. 48. Stored Traces Tab ANTENNA 2 50 78.6 12/30/11 11:58 ANTENNA 5 50 78.6 12/30/11 12:26 CON. 401 100 67.7 1/3/12 07:39 CON. 331 100 67.7 1/3/12 08:38 SENSOR 6-1 100 72.3 1/5/12 09:11 SENSOR 6-2 100 72.3 1/5/12 09:15 FLIR 1 75 74.8 1/10/12 10:27 48 Press first to upload a list of stored traces Direct save TDR memory to PC folderCaution – There is NO UNDELETE
  49. 49. Graphic Plot Screen 49
  50. 50. Setup Tab 50 Press either to obtain valid data (gray text is not valid)
  51. 51. Cables Tab Read the Cable List from TDR or from a stored list on the PC Use these keys and “Select Cable Values” to edit the list Write the Cable List to the TDR or to a stored list on the PC 51
  52. 52. Cleaning Your 20/20 TDR 1. Always spray cleaners and rinse water on a soft cloth, do NOT spray directly on the TDR Soft Cases The soft case should be cleaned the same as the instrument. Use a soft bush to remove tough dirt. Do NOT immerse in water or dry in a dryer. Wash and Dry separately, both instrument and case should be dry before enclosing the instrument in the case. 2. Typical Grime – Use a mild non-abrasive detergent like 409® in water or glass cleaner (non-ammonia) and rinse water to clean 3. Cable Gel – User liquid “citrus” cleaner to remove 4. Tar, creosote or adhesives – Use WD40® followed with mild detergent and water 52
  53. 53. Maintenance, Service and Warranty Basic Guide or Operator Manual, Maintenance, Service & Warranty. Warranty – One year against material & workmanship defects Questions, By all means – Contact us: AEA Technology, Inc. 5933 Sea Lion Place, Ste 112 Carlsbad, CA 92010 Tel: 800-258-7805 or +1-760-931-8979 Fax: +1-760-931-8969 Email Application Notes Operating Manuals TDR PC Vision Data Sheets See “User Troubleshooting Guide” 53
  54. 54. Questions on E20/20 Step TDR ETDR PC Vision software? Windows 7, Vista, and Windows XP are registered trademarks of Microsoft® Corp. 409 is a registered trademark of Clorox® Corp. WD-40 is a registered trademark of WD-40® company 54